JSON for Modern C++ 3.8.0

accept
accept
accept
allocator_type
array
array_t
at
at
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back
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
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basic_json
basic_json
begin
begin
binary
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end
end
erase
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~basic_json
| ## ◆ array()
static basic_json nlohmann::basic_json::array | ( | initializer_list_t | init = `{}` | ) |
| inline static
  Creates a JSON array value from a given initializer list. That is, given a list of values `a, b, c`, creates the JSON value `[a, b, c]`. If the initializer list is empty, the empty array `[]` is created. Note This function is only needed to express two edge cases that cannot be realized with the initializer list constructor (basic_json(initializer_list_t, bool, value_t)). These cases are: creating an array whose elements are all pairs whose first element is a string – in this case, the initializer list constructor would create an object, taking the first elements as keys creating an empty array – passing the empty initializer list to the initializer list constructor yields an empty object Parameters
  [in] | init | initializer list with JSON values to create an array from (optional)
  Returns JSON array value Complexity Linear in the size of init. Exception safety Strong guarantee: if an exception is thrown, there are no changes to any JSON value. Example The following code shows an example for the `array` function. 1 #include <iostream> 2 #include <nlohmann/json.hpp> 3 4 using json = nlohmann::json; 5 6 int main() 7 { 8 // create JSON arrays 9 json j_no_init_list = json::array(); 10 json j_empty_init_list = json::array({}); 11 json j_nonempty_init_list = json::array({1, 2, 3, 4}); 12 json j_list_of_pairs = json::array({ {"one", 1}, {"two", 2} }); 13 14 // serialize the JSON arrays 15 std::cout << j_no_init_list << '\n'; 16 std::cout << j_empty_init_list << '\n'; 17 std::cout << j_nonempty_init_list << '\n'; 18 std::cout << j_list_of_pairs << '\n'; 19 } Output (play with this example online):
      []
      []
      [1,2,3,4]
      [["one",1],["two",2]]
  The example code above can be translated with
      g++ -std=c++11 -Isingle_include doc/examples/array.cpp -o array
See also basic_json(initializer_list_t, bool, value_t) – create a JSON value from an initializer list object(initializer_list_t) – create a JSON object value from an initializer list Since version 1.0.0 Definition at line 17559 of file json.hpp.

nlohmann::basic_json::array
static basic_json array(initializer_list_t init={})
explicitly create an array from an initializer list
Definition: json.hpp:17559
nlohmann::json
basic_json<> json
default JSON class
Definition: json.hpp:2774